[POWERPC] Search for and publish cell OF platform devices earlier

Currently cell publishes OF devices at device_initcall() time, which
means the earliest a driver can bind to a device is also device_initcall()
time.  We have a driver we want to register before other devices, so
publish the devices at subsys_initcall() time.

This should not cause any behaviour change for existing drivers, as they
are still bound at device_initcall() time.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/cell/setup.c

@@ -98,7 +98,7 @@ static int __init cell_publish_devices(void)
 	}
 	return 0;
 }
-machine_device_initcall(cell, cell_publish_devices);
+machine_subsys_initcall(cell, cell_publish_devices);
 
 static void cell_mpic_cascade(unsigned int irq, struct irq_desc *desc)
 {